/*
 * Created on 12-Jun-2005
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.dht.transport.udp.impl.packethandler;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.Debug;

import com.aelitis.azureus.core.dht.transport.udp.impl.DHTTransportUDPImpl;
import com.aelitis.azureus.core.dht.transport.udp.impl.DHTUDPPacketRequest;
import com.aelitis.net.udp.uc.PRUDPPacketHandler;
import com.aelitis.net.udp.uc.PRUDPPacketHandlerFactory;

public class DHTUDPPacketHandlerFactory {
    private static DHTUDPPacketHandlerFactory singleton = new DHTUDPPacketHandlerFactory();

    private Map port_map = new HashMap();

    protected AEMonitor this_mon = new AEMonitor("DHTUDPPacketHandlerFactory");

    public static DHTUDPPacketHandler getHandler(DHTTransportUDPImpl transport, DHTUDPRequestHandler request_handler)

    throws DHTUDPPacketHandlerException {
        return (singleton.getHandlerSupport(transport, request_handler));
    }

    protected DHTUDPPacketHandler getHandlerSupport(DHTTransportUDPImpl transport, DHTUDPRequestHandler request_handler)

    throws DHTUDPPacketHandlerException {
        try {
            this_mon.enter();

            int port = transport.getPort();
            int network = transport.getNetwork();

            Object[] port_details = (Object[]) port_map.get(new Integer(port));

            if (port_details == null) {

                PRUDPPacketHandler packet_handler = PRUDPPacketHandlerFactory.getHandler(port, new DHTUDPPacketNetworkHandler(this, port));

                port_details = new Object[] { packet_handler, new HashMap() };

                port_map.put(new Integer(port), port_details);
            }

            Map network_map = (Map) port_details[1];

            Object[] network_details = (Object[]) network_map.get(new Integer(network));

            if (network_details != null) {

                throw (new DHTUDPPacketHandlerException("Network already added"));
            }

            DHTUDPPacketHandler ph = new DHTUDPPacketHandler(this, network, (PRUDPPacketHandler) port_details[0], request_handler);

            network_map.put(new Integer(network), new Object[] { transport, ph });

            return (ph);

        } finally {

            this_mon.exit();
        }
    }

    protected void destroy(DHTUDPPacketHandler handler) {
        PRUDPPacketHandler packet_handler = handler.getPacketHandler();

        int port = packet_handler.getPort();
        int network = handler.getNetwork();

        try {
            this_mon.enter();

            Object[] port_details = (Object[]) port_map.get(new Integer(port));

            if (port_details == null) {

                return;
            }

            Map network_map = (Map) port_details[1];

            network_map.remove(new Integer(network));

            if (network_map.size() == 0) {

                port_map.remove(new Integer(port));

                try {
                    packet_handler.setRequestHandler(null);

                } catch (Throwable e) {

                    Debug.printStackTrace(e);
                }
            }
        } finally {

            this_mon.exit();
        }
    }

    protected void process(int port, DHTUDPPacketRequest request) {
        try {
            int network = request.getNetwork();

            /*
             * if ( network != 0 ){ System.out.println( "process:" + network + ":" + request.getString()); }
             */

            Object[] port_details = (Object[]) port_map.get(new Integer(port));

            if (port_details == null) {

                throw (new IOException("Port '" + port + "' not registered"));
            }

            Map network_map = (Map) port_details[1];

            Object[] network_details = (Object[]) network_map.get(new Integer(network));

            if (network_details == null) {

                throw (new IOException("Network '" + network + "' not registered"));
            }

            DHTUDPPacketHandler res = (DHTUDPPacketHandler) network_details[1];

            res.receive(request);

        } catch (IOException e) {

            Debug.printStackTrace(e);
        }
    }

    public DHTTransportUDPImpl getTransport(int port, int network)

    throws IOException {
        Object[] port_details = (Object[]) port_map.get(new Integer(port));

        if (port_details == null) {

            throw (new IOException("Port '" + port + "' not registered"));
        }

        Map network_map = (Map) port_details[1];

        Object[] network_details = (Object[]) network_map.get(new Integer(network));

        if (network_details == null) {

            throw (new IOException("Network '" + network + "' not registered"));
        }

        return ((DHTTransportUDPImpl) network_details[0]);
    }
}
